Titan18 said
So can I buy anything on Graphicriver with an extended licence and resell it as my own item?

not really re-sell…what Extended covers I think is, you can include it in a paid product of yours…for example…you make a game that you want to sell…and you can buy a poster here with extended license, and put up in your games wall…etc…with regular license you can’t, well you can but aren’t allowed to.